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Complex responses of birds to landscape-level fire extent, fire severity and environmental drivers

Authors

  • David B. Lindenmayer,

    Corresponding author
    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
    2. ARC Centre of Excellence for Environmental Decisions, The Australian National University, Canberra, ACT, Australia
    3. National Environmental Research Program, The Australian National University, Canberra, ACT, Australia
    4. Long-term Ecological Research Network, The Australian National University, Canberra, ACT, Australia
    • Correspondence: David Lindenmayer, Fenner School of Environment and Society, The Australian National University, Canberra, ACT 0200, Australia.

      E-mail: david.lindenmayer@anu.edu.au

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  • Wade Blanchard,

    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
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  • Lachlan McBurney,

    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
    2. Long-term Ecological Research Network, The Australian National University, Canberra, ACT, Australia
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  • David Blair,

    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
    2. Long-term Ecological Research Network, The Australian National University, Canberra, ACT, Australia
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  • Sam C. Banks,

    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
    2. ARC Centre of Excellence for Environmental Decisions, The Australian National University, Canberra, ACT, Australia
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  • Don A. Driscoll,

    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
    2. ARC Centre of Excellence for Environmental Decisions, The Australian National University, Canberra, ACT, Australia
    3. National Environmental Research Program, The Australian National University, Canberra, ACT, Australia
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  • Annabel L. Smith,

    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
    2. ARC Centre of Excellence for Environmental Decisions, The Australian National University, Canberra, ACT, Australia
    3. National Environmental Research Program, The Australian National University, Canberra, ACT, Australia
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  • A. M. Gill

    1. Fenner School of Environment and Society, The Australian National University, Canberra, ACT, Australia
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Abstract

Aim

To quantify bird responses to a large unplanned fire, taking into consideration landscape-level fire severity and extent, pre-fire site detection frequency and environmental gradients.

Location

South-eastern Australia.

Methods

A major wildfire in 2009 coincided with a long-term study of birds and provided a rare opportunity to quantify bird responses to wildfire. Using hierarchical Bayesian analysis, we modelled bird species richness and the detection frequency of individual species in response to a suite of explanatory variables, including (1) landscape-level fire severity and extent (2) pre-fire detection frequency, (3) site-level vegetation density and (4) environmental variables (e.g. elevation and topography).

Results

Landscape-level fire severity had strong effects on bird species richness and the detection frequency of the majority of bird species. These effects varied markedly between species; most responded negatively to amount of severely burned forest in the landscape, one negatively to the amount of moderately burned forest and one responded negatively to the total area of burned forest. Only one species – the Flame Robin – responded positively to the amount of burned forest. Relationships with landscape-scale fire extent changed over time for one species – the Brown Thornbill – with initially depressed rates of detection recovering after just 2 years. The majority of species were significantly more likely to be detected in burned areas if they have been recorded there prior to the fire.

Main conclusions

Birds responded strongly to the severity and spatial extent of fire. They also exhibited strong site fidelity even after severe wildfire which causes profound changes in vegetation cover – a response likely influenced by environmental features such as elevation and topography.

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